html, body {
    height: 100%;
}

#box {
    /*三个属性集合使用,达到撑满剩余高度*/
    display: flex;
    flex-flow: column;
    height: 100%;
}

#box .box-header {
    height: 60px;
    width: 100%;
    background-color: #a3ccff;
    display: flex; /*使子类div一行显示*/
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
}
#box .box-header .header-left {
    padding-left: 1%;
    width: 600px;
    height: 30px;
    display: flex; /*使子类div一行显示*/
}
#box .box-header .header-left img {
    width: 32px;
    height: 32px;
    margin-left: 2%;
    margin-top: 6px;
}
#box .box-header .header-left .header-title-right {
    width: 160px;
    height: 34px;
    line-height:50px;
    text-align: center;
    position: relative;
    filter:drop-shadow(-5px 0 0 blue);
    /*上面为左竖线效果*/
    margin-top: 17px;
    margin-left: 10px;
    font-size: 16px;
    background-color: #a3ccff;
}
#box .box-header .header-left .header-title {
    font-size: 30px;
    height: 30px;
    margin-left: 2%;

}
#box .box-header .header-right {
    width: 100px;
    padding-right: 0;
    margin-left: 1150px;
    display: flex; /*使子类div一行显示*/
}
#box .box-header .header-right div {
    font-size: 30px;
    margin-top: 20px;
    font-style: italic;
}
#box .box-header .header-right img {
    width: 48px;
    height: 48px;
    margin-top: 6px;
}
#box .box-subject {
    flex: 1;  /*集合父类使用,使其撑满剩余高度*/
    display: flex; /*使子类div一行显示*/
    overflow: hidden; /*溢出隐藏*/
    background-color: #a3ccff;
}
#box .box-subject .left {
    width: 8%;
    height: 100%;
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    color: #454647;
    background-color: #a3ccff;
}
#box .box-subject .left ul li .title{
    /*background-color: red;*/
    margin-top: 10%;
}
#box .box-subject .left ul li .title span{
    margin-left: 10%;
    font-size: 20px;
}
#box .box-subject .left ul li .title img {
    width: 20px;
    height: 20px;
    float: right;
}
#box .box-subject .left ul li .isShow ul {
    font-size: 16px;
    list-style: none; /*ul标签去掉小黑点*/
}
#box .box-subject .left ul li .isShow ul li {
    margin-top: 10%;
    margin-left: 10%;
}

#box .box-subject .right {
    width: 92%;
    height: 100%;
    background-color: #e2e1e4;
}